Developer guides for KYB verification, firmographic enrichment, and sanctions screening with the KnowFirm API.
KnowFirm is a developer-first KYB API: verify, enrich, and sanctions-screen any U.S. business by EIN, name, LEI, or CIK in one call, with confidence scores and per-field provenance.
KYC verifies an individual; KYB (Know Your Business) verifies a company — its identity, registration, ownership, and risk signals. Here's how they differ and how to automate KYB with an API.
Look up a business by its LEI (Legal Entity Identifier) in one API call. KnowFirm resolves the GLEIF LEI to a canonical entity and crosswalks it to SEC CIK, IRS EIN, and FDIC identifiers with provenance.
Screen any business or party name against the U.S. Consolidated Screening List in one API call. KnowFirm returns scored potential matches with the source list and data freshness — informational screening, not legal advice.
Verify a U.S. business by its EIN with one API call. KnowFirm resolves the EIN to a canonical entity with LEI/CIK identifiers, confidence, and provenance.